MOTOROLA SN74LS670N, SN74LS670D Datasheet

SN74LS670

4 x 4 Register File
with 3-State Outputs

The TTL/MSI SN74LS670 is a high-speed, low-power 4 x 4
Register File organized as four words by four bits. Separate read and
write inputs, both address and enable, allow simultaneous read and
write operation.

The 3-state outputs make it possible to connect up to 128 outputs to
increase the word capacity up to 512 words. Any number of these
devices can be operated in parallel to generate an n-bit length.

• Simultaneous Read/Write Operation

• Expandable to 512 Words by n-Bits

• T ypical Access Time to 20 ns

• 3-State Outputs for Expansion

• T ypical Power Dissipation of 125 mW

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LOW

POWER

SCHOTTKY

GUARANTEED OPERATING RANGES

Symbol Parameter Min Typ Max Unit

V

CC

T

I

OH

I

OL

Supply Voltage 4.75 5.0 5.25 V
Operating Ambient

A

T emperature Range
Output Current – High –2.6 mA
Output Current – Low 24 mA

0 25 70 °C

16

1

PLASTIC

N SUFFIX

CASE 648

16

1

SOIC

D SUFFIX

CASE 751B

ORDERING INFORMATION

Device Package Shipping

SN74LS670N 16 Pin DIP 2000 Units/Box

 Semiconductor Components Industries, LLC, 1999

December, 1999 – Rev. 6

SN74LS670D 16 Pin

1 Publication Order Number:

2500/Tape & Reel

SN74LS670/D

SN74LS670

CONNECTION DIAGRAM DIP (TOP VIEW)

D1WAWBE

V

CC

16 15

W

14 13 12 11 10 9

Q

E

R

Q

1

2

NOTE:
The Flatpak version has the same
pinouts (Connection Diagram) as
the Dual In-Line Package.

123456

D

D3D4RBRAQ4Q3GND

2

PIN NAMES

D

– D

1

WA, W
E

W

RA, R
E

R

Q1 – Q

4
B

B

4

Data Inputs
Write Address Inputs
Write Enable (Active LOW) Input
Read Address Inputs
Read Enable (Active LOW) Input
Outputs

NOTES:

a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.

LOGIC SYMBOL

12 15 1 2 3

D

W

1

Q1Q2Q3Q

R

D

2

14
13

5
4

E

W

A

W

B

R

A

R

B

E

D3D

7

HIGH LOW

0.5 U.L.

0.5 U.L.

1.0 U.L.

0.5 U.L.

1.5 U.L.
65 U.L.

4

4

8

(Note a)LOADING

0.25 U.L.

0.25 U.L.

0.5 U.L.

0.25 U.L.

0.75 U.L.
15 U.L.

11 10 9 7 6

= PIN 16

V

CC

GND = PIN 8

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2

SN74LS670

LOGIC DIAGRAM

D

4

12

E

W

13

W

B

14

W

A

3

D

3

D

2

12

D

1

15

WORD

0

GD

Q

GD

Q

GD

Q

GD

Q

WORD

GD

Q

GD

Q

GD

Q

GD

1

Q

WORD

2

GD

Q

GD

Q

GD

Q

GD

Q

WORD

3

GD

Q

4

R

B

11

E

R

5

R

A

67

Q

4

GD

Q

Q

3

GD

Q

Q

2

9

GD

Q

Q

10

1

VCC = PIN 16
GND = PIN 8

= PIN NUMBERS

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3